Fuel Injection Device Discharge Prevention Mechanism
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Solution Overview
Problem
The existing fuel injection devices for diesel engines suffer from low efficiency due to the discharge of most fuel to the outside when the injection control valve shifts from the first position to the second position, resulting in inefficient fuel usage.
Innovation Solution
A fuel injection device with a nozzle body, needle valve, and injection control valve, where a discharge prevention mechanism, including a close assistance piston, prevents fuel from discharging to the outside by controlling the communication between fuel passages and chambers, ensuring efficient fuel usage and improved injection pressure characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the injection control valve shifts from the first position to the second position to stop fuel injection, then fuel injection is stopped, but most of the fuel already flowed in the nozzle body is discharged to the outside, reducing efficiency
Solution Approach 1:
The fuel discharge path is segmented into multiple controlled passages. The third fuel passage is divided into a first portion (from first fuel chamber to third fuel chamber) and a second portion (from third fuel chamber to outside). The discharge prevention means selectively blocks the first portion while allowing the second portion to function, preventing waste fuel discharge while maintaining injection control capability.
Solution Approach 2:
The discharge prevention means acts as an intermediary component between the first fuel chamber and the third fuel chamber. It selectively controls fuel flow by blocking the first portion of the third fuel passage when the injection control valve shifts to the second position, preventing fuel from being discharged to the outside while allowing proper fuel injection control.
2Ease of operation
If the injection control valve shifts position to stop injection, then injection control is achieved, but fuel efficiency deteriorates due to excessive fuel discharge
Solution Approach 1:
The discharge prevention means is pre-configured to automatically block the first portion of the third fuel passage when the injection control valve shifts to the second position. This preliminary action prevents fuel discharge loss before it can occur, maintaining fuel efficiency without requiring additional operational steps or complicating the injection control valve operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces fuel discharge to the outside, enhancing the overall fuel supply system efficiency, improves the closing velocity of the needle valve, and allows for more precise control of fuel injection, resulting in shorter injection times and reduced fuel amounts.
Implementation Method 1
the injection control valve 120 provided movably forward and rearward in this nozzle body 140, which is biased in the rearward direction by the spring 121
Implementation Method 2
the needle valve 110 provided movably forward and rearward in this nozzle body 140, which is biased in the forward direction by the spring 111
Implementation Method 3
the needle valve 110 retreats to inject fuel, resisting the biasing force of the spring 111 by the pressure of the fuel flowed in the second fuel chamber 142
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
To provide a fuel injection device capable of reducing the amount of fuel discharging to the outside. The fuel injection device is provided with the nozzle body, the injection control valve, and the close assistance piston. In the nozzle body, the first fuel chamber and the nozzle valve close chamber are formed. The injection control valve advances to a first position, thereby allowing the first fuel passage to be communicated with the first fuel chamber and blocking access from the first fuel chamber to the third fuel passage, and the injection control valve retreats to a second position, thereby blocking access from the first fuel passage to the first fuel chamber and allowing the first fuel chamber to be communicated with the third fuel passage. The close assistance piston prevents fuel in the first fuel chamber from discharging to the outside of the fuel injection device.